split unit tests (#16455)

Co-authored-by: legobeat <109787230+legobeat@users.noreply.github.com>
2024-12-22 09:23:21 +01:00 · 2023-01-11 13:23:38 -05:00 · 2023-01-11 13:23:38 -05:00 · 64839b6bf7
commit 64839b6bf7
parent 01c0d7823d
14 changed files with 580 additions and 179 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@ -16,6 +16,7 @@ executors:

 orbs:
  gh: circleci/github-cli@2.0
+  codecov: codecov/codecov@3.2.2

 workflows:
  test_and_release:
@ -93,9 +94,20 @@ workflows:
      - test-e2e-chrome-mv3:
          requires:
            - prep-build-test-mv3
-      - test-unit:
+      - test-unit-mocha:
          requires:
            - prep-deps
+      - test-unit-jest-main:
+          requires:
+            - prep-deps
+      - test-unit-jest-development:
+          requires:
+            - prep-deps
+      - upload-and-validate-coverage:
+          requires:
+            - test-unit-jest-main
+            - test-unit-jest-development
+            - test-unit-mocha
      - test-unit-global:
          requires:
            - prep-deps
@ -127,8 +139,11 @@ workflows:
            - test-lint-shellcheck
            - test-lint-lockfile
            - test-lint-changelog
-            - test-unit
+            - test-unit-jest-main
+            - test-unit-jest-development
            - test-unit-global
+            - test-unit-mocha
+            - upload-and-validate-coverage
            - validate-source-maps
            - validate-source-maps-beta
            - validate-source-maps-flask
@ -823,9 +838,6 @@ jobs:
      - store_artifacts:
          path: coverage
          destination: coverage
-      - store_artifacts:
-          path: jest-coverage
-          destination: jest-coverage
      - store_artifacts:
          path: test-artifacts
          destination: test-artifacts
@ -902,8 +914,8 @@ jobs:
            git config user.email metamaskbot@users.noreply.github.com
            yarn ts-migration:dashboard:deploy

-  test-unit:
-    executor: node-browsers
+  test-unit-mocha:
+    executor: node-browsers-medium-plus
    steps:
      - checkout
      - attach_workspace:
@ -911,24 +923,60 @@ jobs:
      - run:
          name: test:coverage:mocha
          command: yarn test:coverage:mocha
-      - run:
-          name: test:coverage:jest
-          command: yarn test:coverage:jest
-      - run:
-          name: Validate coverage thresholds
-          command: |
-            if ! git diff --exit-code jest.config.js development/jest.config.js; then
-              echo "Detected changes in coverage thresholds"
-              exit 1
-            fi
      - persist_to_workspace:
          root: .
          paths:
            - .nyc_output
            - coverage
-            - jest-coverage
+
+  test-unit-jest-development:
+    executor: node-browsers
+    steps:
+      - checkout
+      - attach_workspace:
+          at: .
+      - run:
+          name: jest development unit tests
+          command: yarn test:coverage:jest:dev
+      - persist_to_workspace:
+          root: .
+          paths:
+            - coverage
      - store_test_results:
          path: test/test-results/junit.xml
+
+  test-unit-jest-main:
+    executor: node-browsers-medium-plus
+    parallelism: 12
+    steps:
+      - checkout
+      - attach_workspace:
+          at: .
+      - run:
+          name: test:coverage:jest
+          command: yarn test:coverage:jest
+      - persist_to_workspace:
+          root: .
+          paths:
+            - coverage
+      - store_test_results:
+          path: test/test-results/junit.xml
+
+  upload-and-validate-coverage:
+    executor: node-browsers
+    steps:
+      - checkout
+      - attach_workspace:
+          at: .
+      - codecov/upload
+      - run:
+          name: test:coverage:validate
+          command: yarn test:coverage:validate
+      - persist_to_workspace:
+          root: .
+          paths:
+            - coverage
+
  test-unit-global:
    executor: node-browsers
    steps:
--- a/.depcheckrc.yml
+++ b/.depcheckrc.yml
@ -36,6 +36,7 @@ ignores:
  - 'source-map-explorer'
  # development tool
  - 'improved-yarn-audit'
+  - 'nyc'
  # storybook
  - '@storybook/core'
  - '@storybook/addon-essentials'
--- a/.eslintrc.js
+++ b/.eslintrc.js
@ -42,6 +42,8 @@ module.exports = {
        'test/e2e/**/*.js',
        'test/helpers/*.js',
        'test/lib/wait-until-called.js',
+        'test/run-unit-tests.js',
+        'test/merge-coverage.js',
      ],
      extends: [
        path.resolve(__dirname, '.eslintrc.base.js'),
@ -337,6 +339,8 @@ module.exports = {
        'development/**/*.js',
        'test/e2e/benchmark.js',
        'test/helpers/setup-helper.js',
+        'test/run-unit-tests.js',
+        'test/merge-coverage.js',
      ],
      rules: {
        'node/no-process-exit': 'off',
--- a/codecov.yml
+++ b/codecov.yml
@ -0,0 +1,16 @@
+codecov:
+  bot: 'codecov-io'
+  require_ci_to_pass: yes
+coverage:
+  round: nearest
+  status:
+    project:
+      global:
+        target: auto
+        threshold: 0%
+        base: auto
+      transforms:
+        target: 100%
+        threshold: 0%
+        paths:
+          - development/build/transforms/**/*.js
--- a/coverage-targets.js
+++ b/coverage-targets.js
@ -0,0 +1,20 @@
+// Codecov uses a yaml file for its configuration and it targets line coverage.
+// To keep our policy in place we have thile file separate from our
+// codecov.yml file that specifies coverage targets for each project in the
+// codecov.yml file. These targets are read by the test/merge-coverage.js
+// script, and the paths from the codecov.yml file are used to figure out which
+// subset of files to check against these targets.
+module.exports = {
+  global: {
+    branches: 20,
+    functions: 30,
+    lines: 57,
+    statements: 40,
+  },
+  transforms: {
+    branches: 100,
+    functions: 100,
+    lines: 100,
+    statements: 100,
+  },
+};
--- a/development/jest.config.js
+++ b/development/jest.config.js
@ -1,19 +1,11 @@
 module.exports = {
  displayName: '/development',
-  collectCoverageFrom: ['<rootDir>/**/*.js'],
-  coverageDirectory: '../jest-coverage/development/',
-  coverageReporters: ['html', 'text-summary', 'json-summary'],
-  coverageThreshold: {
-    './development/build/transforms/**/*.js': {
-      branches: 100,
-      functions: 100,
-      lines: 100,
-      statements: 100,
-    },
-  },
+  collectCoverageFrom: ['<rootDir>/build/transforms/**/*.js'],
+  coverageDirectory: '../coverage',
+  coverageReporters: ['json'],
  resetMocks: true,
  restoreMocks: true,
  testEnvironment: 'node',
-  testMatch: ['<rootDir>/build/**/*.test.js'],
+  testMatch: ['<rootDir>/build/transforms/**/*.test.js'],
  testTimeout: 2500,
 };
--- a/jest.config.js
+++ b/jest.config.js
@ -1,33 +1,19 @@
 module.exports = {
  collectCoverageFrom: [
+    '<rootDir>/app/scripts/constants/error-utils.js',
+    '<rootDir>/app/scripts/controllers/network/**/*.js',
    '<rootDir>/app/scripts/controllers/permissions/**/*.js',
+    '<rootDir>/app/scripts/flask/**/*.js',
+    '<rootDir>/app/scripts/lib/**/*.js',
    '<rootDir>/app/scripts/lib/createRPCMethodTrackingMiddleware.js',
+    '<rootDir>/app/scripts/migrations/*.js',
+    '<rootDir>/app/scripts/platforms/*.js',
    '<rootDir>/shared/**/*.js',
    '<rootDir>/ui/**/*.js',
  ],
-  coverageDirectory: './jest-coverage/main',
+  coverageDirectory: './coverage',
  coveragePathIgnorePatterns: ['.stories.js', '.snap'],
-  coverageReporters: ['html', 'text-summary', 'json-summary'],
-  coverageThreshold: {
-    global: {
-      branches: 48,
-      functions: 46,
-      lines: 52,
-      statements: 52,
-    },
-    './app/scripts/controllers/permissions/**/*.js': {
-      branches: 100,
-      functions: 100,
-      lines: 100,
-      statements: 100,
-    },
-    './app/scripts/lib/createRPCMethodTrackingMiddleware.js': {
-      branches: 95.65,
-      functions: 100,
-      lines: 100,
-      statements: 100,
-    },
-  },
+  coverageReporters: ['json'],
  reporters: [
    'default',
    [
@ -48,16 +34,16 @@ module.exports = {
  ],
  setupFilesAfterEnv: ['<rootDir>/test/jest/setup.js'],
  testMatch: [
-    '<rootDir>/ui/**/*.test.js',
-    '<rootDir>/shared/**/*.test.js',
-    '<rootDir>/app/scripts/lib/**/*.test.js',
-    '<rootDir>/app/scripts/migrations/*.test.js',
-    '<rootDir>/app/scripts/platforms/*.test.js',
+    '<rootDir>/app/scripts/constants/error-utils.test.js',
    '<rootDir>/app/scripts/controllers/network/**/*.test.js',
    '<rootDir>/app/scripts/controllers/permissions/**/*.test.js',
    '<rootDir>/app/scripts/flask/**/*.test.js',
+    '<rootDir>/app/scripts/lib/**/*.test.js',
    '<rootDir>/app/scripts/lib/createRPCMethodTrackingMiddleware.test.js',
-    '<rootDir>/app/scripts/constants/error-utils.test.js',
+    '<rootDir>/app/scripts/migrations/*.test.js',
+    '<rootDir>/app/scripts/platforms/*.test.js',
+    '<rootDir>/shared/**/*.test.js',
+    '<rootDir>/ui/**/*.test.js',
  ],
  testTimeout: 2500,
  // We have to specify the environment we are running in, which is jsdom. The
--- a/nyc.config.js
+++ b/nyc.config.js
@ -1,6 +0,0 @@
-module.exports = {
-  branches: 95,
-  lines: 95,
-  functions: 95,
-  statements: 95,
-};
--- a/package.json
+++ b/package.json
@ -26,17 +26,21 @@
    "dapp-chain": "GANACHE_ARGS='-b 2' concurrently -k -n ganache,dapp -p '[{time}][{name}]' 'yarn ganache:start' 'sleep 5 && yarn dapp'",
    "forwarder": "node ./development/static-server.js ./node_modules/@metamask/forwarder/dist/ --port 9010",
    "dapp-forwarder": "concurrently -k -n forwarder,dapp -p '[{time}][{name}]' 'yarn forwarder' 'yarn dapp'",
-    "test:unit": "./test/test-unit-combined.sh",
+    "test:unit": "node ./test/run-unit-tests.js --mocha --jestGlobal --jestDev",
    "test:unit:jest": "./test/test-unit-jest.sh",
    "test:unit:global": "mocha test/unit-global/*.test.js",
-    "test:unit:mocha": "mocha './app/**/*.test.js'",
+    "test:unit:mocha": "node ./test/run-unit-tests.js --mocha",
    "test:e2e:chrome": "SELENIUM_BROWSER=chrome node test/e2e/run-all.js",
    "test:e2e:chrome:snaps": "SELENIUM_BROWSER=chrome node test/e2e/run-all.js --snaps",
    "test:e2e:firefox": "SELENIUM_BROWSER=firefox node test/e2e/run-all.js",
    "test:e2e:firefox:snaps": "SELENIUM_BROWSER=firefox node test/e2e/run-all.js --snaps",
    "test:e2e:single": "node test/e2e/run-e2e-test.js",
-    "test:coverage:mocha": "nyc --reporter=text --reporter=html yarn test:unit:mocha",
-    "test:coverage:jest": "yarn test:unit:jest --coverage --maxWorkers=2 && yarn jest-it-up -m 5",
+    "test:coverage:mocha": "node ./test/run-unit-tests.js --mocha --coverage",
+    "test:coverage:jest": "node ./test/run-unit-tests.js --jestGlobal --coverage",
+    "test:coverage:jest:dev": "node ./test/run-unit-tests.js --jestDev --coverage",
+    "test:coverage:validate": "node ./test/merge-coverage.js",
+    "test:coverage": "node ./test/run-unit-tests.js --mocha --jestGlobal --jestDev --coverage && yarn test:coverage:validate",
+    "test:coverage:html": "yarn test:coverage --html",
    "ganache:start": "./development/run-ganache.sh",
    "sentry:publish": "node ./development/sentry-publish.js",
    "lint": "yarn lint:prettier && yarn lint:eslint && yarn lint:tsc && yarn lint:styles",
@ -447,10 +451,13 @@
    "history": "^5.0.0",
    "improved-yarn-audit": "^3.0.0",
    "ini": "^3.0.0",
+    "istanbul-lib-coverage": "^3.2.0",
+    "istanbul-lib-report": "^3.0.0",
+    "istanbul-reports": "^3.1.5",
    "jest": "^29.1.2",
    "jest-canvas-mock": "^2.3.1",
    "jest-environment-jsdom": "^29.1.2",
-    "jest-it-up": "^2.0.2",
+    "js-yaml": "^4.1.0",
    "jsdom": "^11.2.0",
    "koa": "^2.7.0",
    "lavamoat": "^6.2.0",
--- a/test/merge-coverage.js
+++ b/test/merge-coverage.js
@ -0,0 +1,245 @@
+const fs = require('fs');
+const path = require('path');
+const libCoverage = require('istanbul-lib-coverage');
+const libReport = require('istanbul-lib-report');
+const reports = require('istanbul-reports');
+const glob = require('fast-glob');
+const yargs = require('yargs/yargs');
+const { hideBin } = require('yargs/helpers');
+const yaml = require('js-yaml');
+const codecovTargets = require('../coverage-targets');
+
+const codecovConfig = yaml.load(fs.readFileSync('codecov.yml', 'utf8'));
+
+const COVERAGE_DIR = './coverage/';
+
+/**
+ * Load .json file at path and parse it into a javascript object
+ *
+ * @param {string} filePath - path to the file to load
+ * @returns {object} the JavaScript object parsed from the file
+ */
+function loadData(filePath) {
+  const json = fs.readFileSync(filePath);
+  return JSON.parse(json);
+}
+
+/**
+ * Loads an array of json coverage files and merges them into a final coverage
+ * report.
+ *
+ * @param {string[]} files - array of strings that are paths to files
+ * @returns {libCoverage.CoverageMap} CoverageMap
+ */
+function mergeCoverageMaps(files) {
+  const coverageMap = libCoverage.createCoverageMap({});
+
+  files.forEach((covergeFinalFile) => {
+    coverageMap.merge(loadData(covergeFinalFile));
+  });
+
+  return coverageMap;
+}
+
+/**
+ * Given a target directory and a coverageMap generates a finalized coverage
+ * summary report and saves it to the directory.
+ *
+ * @param {string} dir - target directory
+ * @param {libCoverage.CoverageMap} coverageMap - CoverageMap to report on
+ * @param reportType
+ * @param reportOptions
+ */
+function generateSummaryReport(dir, coverageMap, reportType, reportOptions) {
+  const context = libReport.createContext({
+    dir,
+    coverageMap,
+  });
+
+  reports.create(reportType, reportOptions ?? {}).execute(context);
+}
+
+/**
+ * Generates a multiline string with coverage data
+ *
+ * @param {CoverageTarget} target - Target coverage threshold
+ * @param {import('istanbul-lib-coverage').CoverageSummaryData} actual -
+ *  istanbul coverage summary detailing actual summary
+ * @returns {string} multiline report of coverage
+ */
+function generateConsoleReport(target, actual) {
+  const { lines, branches, functions, statements } = actual.data;
+  const breakdown =
+    `Lines: ${lines.covered}/${lines.total} (${lines.pct}%). Target: ${target.lines}%\n` +
+    `Branches: ${branches.covered}/${branches.total} (${branches.pct}%). Target: ${target.branches}%\n` +
+    `Statements: ${statements.covered}/${statements.total} (${statements.pct}%). Target: ${target.statements}%\n` +
+    `Functions: ${functions.covered}/${functions.total} (${functions.pct}%). Target: ${target.functions}%`;
+  return breakdown;
+}
+
+/**
+ * @typedef {object} CoverageTarget
+ * @property {number} lines - percentage of lines that must be covered
+ * @property {number} statements - percentage of statements that must be covered
+ * @property {number} branches - percentage of branches that must be covered
+ * @property {number} functions - percentage of functions that must be covered
+ */
+
+/**
+ * Checks if the coverage meets target
+ *
+ * @param {CoverageTarget} target
+ * @param {import('istanbul-lib-coverage').CoverageSummaryData} actual
+ * @returns {boolean}
+ */
+function isCoverageInsufficient(target, actual) {
+  const lineCoverageNotMet = actual.lines.pct < target.lines;
+  const branchCoverageNotMet = actual.branches.pct < target.branches;
+  const functionCoverageNotMet = actual.functions.pct < target.functions;
+  const statementCoverageNotMet = actual.statements.pct < target.statements;
+  return (
+    lineCoverageNotMet ||
+    branchCoverageNotMet ||
+    functionCoverageNotMet ||
+    statementCoverageNotMet
+  );
+}
+
+/**
+ * Checks if the coverage should be bumped up
+ *
+ * @param {CoverageTarget} target
+ * @param {import('istanbul-lib-coverage').CoverageSummaryData} actual
+ * @returns {boolean}
+ */
+function shouldCoverageBeBumped(target, actual) {
+  const lineCoverageNeedsBumped = actual.lines.pct > target.lines + 5;
+  const branchCoverageNeedsBumped = actual.branches.pct > target.branches + 5;
+  const functionCoverageNeedsBumped =
+    actual.functions.pct > target.functions + 5;
+  const statementCoverageNeedsBumped =
+    actual.statements.pct > target.statements + 5;
+  return (
+    lineCoverageNeedsBumped ||
+    branchCoverageNeedsBumped ||
+    functionCoverageNeedsBumped ||
+    statementCoverageNeedsBumped
+  );
+}
+
+/**
+ * Creates and returns a combined coverage summary report of every file in the
+ * provided array.
+ *
+ * @param {string[]} files - array of files generated by fast-glob
+ * @param {libCoverage.CoverageMap} coverageMap
+ * @returns {import('istanbul-lib-coverage').CoverageSummaryData}
+ */
+function getFileCoverage(files, coverageMap) {
+  const subCoverageMap = libCoverage.createCoverageMap({});
+
+  files.forEach((file) => {
+    try {
+      subCoverageMap.merge(
+        coverageMap.fileCoverageFor(`${process.cwd()}/${file}`),
+      );
+    } catch {
+      // If the coverage doesn't exist, it means that it was excluded from
+      // coverage or had no coverage to report, which is fine. Glob is a lot
+      // wider of a net then what the test file runners match against.
+    }
+  });
+
+  const summary = subCoverageMap.getCoverageSummary();
+  return summary;
+}
+
+/**
+ * Checks coverage and reports to console
+ * Throws an error if coverage isn't met
+ *
+ * @param {string} name - The target's name from coverageThresholds in jest
+ *  config
+ * @param {CoverageTarget} target - the target coverage threshold
+ * @param {import('istanbul-lib-coverage').CoverageSummaryData} actual -
+ *  istanbul coverage summary representing actual coverage
+ */
+function checkCoverage(name, target, actual) {
+  const breakdown = generateConsoleReport(target, actual);
+  if (isCoverageInsufficient(target, actual)) {
+    const errorMsg = `Coverage thresholds for ${name} NOT met\n${breakdown}`;
+    throw new Error(errorMsg);
+  } else if (shouldCoverageBeBumped(target, actual)) {
+    const errorMsg = `Coverage EXCEEDS threshold for ${name} and must be bumped\n${breakdown}`;
+    throw new Error(errorMsg);
+  }
+  console.log(`Coverage thresholds for ${name} met\n${breakdown}\n\n`);
+}
+
+/**
+ * Primary script function
+ */
+async function start() {
+  const {
+    argv: { html },
+  } = yargs(hideBin(process.argv)).usage(
+    '$0 [options]',
+    'Run unit tests on the application code.',
+    (yargsInstance) =>
+      yargsInstance
+        .option('html', {
+          alias: ['h'],
+          default: false,
+          description: 'Generate HTML report',
+          type: 'boolean',
+        })
+        .strict(),
+  );
+  // First get all of the files matching the pattern coverage-final-${n}.json
+  // from the coverage directory
+  const files = fs.readdirSync(COVERAGE_DIR);
+  const filePaths = files
+    .filter(
+      (file) =>
+        path.basename(file).startsWith('coverage-final') &&
+        path.extname(file) === '.json',
+    )
+    .map((file) => path.join(COVERAGE_DIR, file));
+
+  // Next, generate a coverageMap
+  const coverageMap = mergeCoverageMaps(filePaths, true);
+
+  // Persist this to file, which may eventually be used in more steps
+  generateSummaryReport(COVERAGE_DIR, coverageMap, 'json-summary');
+  if (html) {
+    generateSummaryReport(COVERAGE_DIR, coverageMap, 'html');
+  }
+
+  // Use the keys in coverageThreshold in jest config to determine targets
+  const coverageTargets = Object.keys(codecovConfig.coverage.status.project);
+
+  // Check coverage totals for each target
+  coverageTargets.forEach((target) => {
+    const summary =
+      target === 'global'
+        ? coverageMap.getCoverageSummary()
+        : getFileCoverage(
+            glob.sync([
+              ...codecovConfig.coverage.status.project[target].paths,
+              // checking test file coverage is redundant.
+              '!**/*.test.js',
+              '!**/__mocks__/**/*.js',
+              '!**/*.stories.js',
+            ]),
+            coverageMap,
+          );
+    // Check and validate the coverage
+    checkCoverage(target, codecovTargets[target], summary);
+  });
+}
+
+start().catch((error) => {
+  // Report the errored coverage check
+  console.error(error);
+  process.exit(1);
+});
--- a/test/run-unit-tests.js
+++ b/test/run-unit-tests.js
@ -0,0 +1,192 @@
+const { hideBin } = require('yargs/helpers');
+const yargs = require('yargs/yargs');
+const { runCommand, runInShell } = require('../development/lib/run-command');
+
+const { CIRCLE_NODE_INDEX, CIRCLE_NODE_TOTAL } = process.env;
+
+const GLOBAL_JEST_CONFIG = './jest.config.js';
+const DEVELOPMENT_JEST_CONFIG = './development/jest.config.js';
+
+start().catch((error) => {
+  console.error(error);
+  process.exit(1);
+});
+
+/**
+ * @typedef {object} JestParams
+ * @property {'global' | 'dev'} target - Which configuration to use for Jest.
+ * @property {boolean} [coverage] - Whether to collect coverage during testing.
+ * @property {number} [currentShard] - Current process number when using test
+ *  splitting across many processes.
+ * @property {number} [totalShards] - Total number of processes tests will be
+ *  split across.
+ * @property {number} [maxWorkers] - Total number of workers to use when
+ *  running tests.
+ */
+
+/**
+ * Execute jest test runner with given params
+ *
+ * @param {JestParams} params - Configuration for jest test runner
+ */
+async function runJest(
+  { target, coverage, currentShard, totalShards, maxWorkers } = {
+    target: 'global',
+    coverage: false,
+    currentShard: 1,
+    totalShards: 1,
+    maxWorkers: 2,
+  },
+) {
+  const options = [
+    'jest',
+    `--config=${
+      target === 'global' ? GLOBAL_JEST_CONFIG : DEVELOPMENT_JEST_CONFIG
+    }`,
+  ];
+  options.push(`--maxWorkers=${maxWorkers}`);
+  if (coverage) {
+    options.push('--coverage');
+  }
+  // We use jest's new 'shard' feature to run tests in parallel across many
+  // different processes if totalShards > 1
+  if (totalShards > 1) {
+    options.push(`--shard=${currentShard}/${totalShards}`);
+  }
+  await runInShell('yarn', options);
+  if (coverage) {
+    // Once done we rename the coverage file so that it is unique among test
+    // runners and job number
+    await runCommand('mv', [
+      './coverage/coverage-final.json',
+      `./coverage/coverage-final-${target}-${currentShard}.json`,
+    ]);
+  }
+}
+
+/**
+ * Run mocha tests on the app directory. Mocha tests do not yet support
+ * parallelism / test-splitting.
+ *
+ * @param {boolean} coverage - Use nyc to collect coverage
+ */
+async function runMocha({ coverage }) {
+  const options = ['mocha', './app/**/*.test.js'];
+  // If coverage is true, then we need to run nyc as the first command
+  // and mocha after, so we use unshift to add three options to the beginning
+  // of the options array.
+  if (coverage) {
+    options.unshift('nyc', '--reporter=json', 'yarn');
+  }
+  await runInShell('yarn', options);
+  if (coverage) {
+    // Once done we rename the coverage file so that it is unique among test
+    // runners
+    await runCommand('mv', [
+      './coverage/coverage-final.json',
+      `./coverage/coverage-final-mocha.json`,
+    ]);
+  }
+}
+
+async function start() {
+  const {
+    argv: { mocha, jestGlobal, jestDev, coverage, fakeParallelism, maxWorkers },
+  } = yargs(hideBin(process.argv)).usage(
+    '$0 [options]',
+    'Run unit tests on the application code.',
+    (yargsInstance) =>
+      yargsInstance
+        .option('mocha', {
+          alias: ['m'],
+          default: false,
+          description: 'Run Mocha tests',
+          type: 'boolean',
+        })
+        .option('jestDev', {
+          alias: ['d'],
+          default: false,
+          description: 'Run Jest tests with development folder config',
+          type: 'boolean',
+        })
+        .option('jestGlobal', {
+          alias: ['g'],
+          default: false,
+          demandOption: false,
+          description: 'Run Jest global (primary config) tests',
+          type: 'boolean',
+        })
+        .option('coverage', {
+          alias: ['c'],
+          default: true,
+          demandOption: false,
+          description: 'Collect coverage',
+          type: 'boolean',
+        })
+        .option('fakeParallelism', {
+          alias: ['f'],
+          default: 0,
+          demandOption: false,
+          description:
+            'Pretend to be CircleCI and fake parallelism (use at your own risk)',
+          type: 'number',
+        })
+        .option('maxWorkers', {
+          alias: ['mw'],
+          default: 2,
+          demandOption: false,
+          description:
+            'The safer way to increase performance locally, sets the number of processes to use internally. Recommended 2',
+          type: 'number',
+        })
+        .strict(),
+  );
+
+  const circleNodeIndex = parseInt(CIRCLE_NODE_INDEX ?? '0', 10);
+  const circleNodeTotal = parseInt(CIRCLE_NODE_TOTAL ?? '1', 10);
+
+  const maxProcesses = fakeParallelism > 0 ? fakeParallelism : circleNodeTotal;
+  const currentProcess = circleNodeIndex;
+
+  if (fakeParallelism) {
+    console.log(
+      `Using fake parallelism of ${fakeParallelism}. Your machine may become as useful as a brick during this operation.`,
+    );
+    if (jestGlobal && jestDev) {
+      throw new Error(
+        'Do not try to run both jest test configs with fakeParallelism, bad things could happen.',
+      );
+    } else if (mocha) {
+      throw new Error('Test splitting is not supported for mocha yet.');
+    } else {
+      const processes = [];
+      for (let x = 0; x < fakeParallelism; x++) {
+        processes.push(
+          runJest({
+            target: jestGlobal ? 'global' : 'dev',
+            totalShards: fakeParallelism,
+            currentShard: x + 1,
+            maxWorkers: 1, // ignore maxWorker option on purpose
+          }),
+        );
+      }
+      await Promise.all(processes);
+    }
+  } else {
+    const options = {
+      coverage,
+      currentShard: currentProcess + 1,
+      totalShards: maxProcesses,
+      maxWorkers,
+    };
+    if (mocha) {
+      await runMocha(options);
+    }
+    if (jestDev) {
+      await runJest({ target: 'dev', ...options });
+    }
+    if (jestGlobal) {
+      await runJest({ target: 'global', ...options });
+    }
+  }
+}
--- a/test/test-unit-combined.sh
+++ b/test/test-unit-combined.sh
@ -1,11 +0,0 @@
-#!/usr/bin/env bash
-
-set -x
-set -e
-set -u
-set -o pipefail
-
-concurrently --raw -n mocha,jest,global \
-  "yarn test:unit:mocha" \
-  "yarn test:unit:jest" \
-  "yarn test:unit:global"
--- a/test/test-unit-jest.sh
+++ b/test/test-unit-jest.sh
@ -1,10 +0,0 @@
-#!/usr/bin/env bash
-
-set -x
-set -e
-set -u
-set -o pipefail
-
-concurrently -n production,development \
-  "jest --config=./jest.config.js $*" \
-  "jest --config=./development/jest.config.js $*"
--- a/yarn.lock
+++ b/yarn.lock
@ -2621,44 +2621,6 @@ __metadata:
  languageName: node
  linkType: hard

-"@inquirer/confirm@npm:^0.0.14-alpha.0":
-  version: 0.0.14-alpha.0
-  resolution: "@inquirer/confirm@npm:0.0.14-alpha.0"
-  dependencies:
-    "@inquirer/core": ^0.0.15-alpha.0
-    "@inquirer/input": ^0.0.15-alpha.0
-    chalk: ^4.1.1
-  checksum: 84daf47030318e0adf6eeef85388e341f6f68c0c06c0d1d329cb6185f6d21abf74c3124102bf62f4f42145c8dc9193d719209e3759987a1bdbcfb88139b9936c
-  languageName: node
-  linkType: hard
-
-"@inquirer/core@npm:^0.0.15-alpha.0":
-  version: 0.0.15-alpha.0
-  resolution: "@inquirer/core@npm:0.0.15-alpha.0"
-  dependencies:
-    ansi-escapes: ^4.2.1
-    chalk: ^4.1.1
-    cli-spinners: ^2.6.0
-    cli-width: ^3.0.0
-    lodash: ^4.17.21
-    mute-stream: ^0.0.8
-    run-async: ^2.3.0
-    string-width: ^4.1.0
-    strip-ansi: ^6.0.0
-  checksum: 26a94a8db80e57f926c889b5730c6c9a0f18d6bf1e6dbfb68eaa6bcda33550db66118ce6afd9e91130ea2e4da42b6d7236b94c16fbab931ed04b4f442b9a5c78
-  languageName: node
-  linkType: hard
-
-"@inquirer/input@npm:^0.0.15-alpha.0":
-  version: 0.0.15-alpha.0
-  resolution: "@inquirer/input@npm:0.0.15-alpha.0"
-  dependencies:
-    "@inquirer/core": ^0.0.15-alpha.0
-    chalk: ^4.1.1
-  checksum: c294b2fa100e2955e271b1b0590b5f360c65c560d653f39554cd381f145fdf13be9ea2c3c069d39a71f84fc3c8ba20d9d78a0b210f8cb5533d138567029e28ee
-  languageName: node
-  linkType: hard
-
 "@istanbuljs/load-nyc-config@npm:^1.0.0":
  version: 1.0.0
  resolution: "@istanbuljs/load-nyc-config@npm:1.0.0"
@ -8363,13 +8325,6 @@ __metadata:
  languageName: node
  linkType: hard

-"ansi-colors@npm:^4.1.0":
-  version: 4.1.1
-  resolution: "ansi-colors@npm:4.1.1"
-  checksum: 138d04a51076cb085da0a7e2d000c5c0bb09f6e772ed5c65c53cb118d37f6c5f1637506d7155fb5f330f0abcf6f12fa2e489ac3f8cdab9da393bf1bb4f9a32b0
-  languageName: node
-  linkType: hard
-
 "ansi-escapes@npm:^4.2.1":
  version: 4.3.0
  resolution: "ansi-escapes@npm:4.3.0"
@ -11227,7 +11182,7 @@ __metadata:
  languageName: node
  linkType: hard

-"cli-spinners@npm:^2.5.0, cli-spinners@npm:^2.6.0":
+"cli-spinners@npm:^2.5.0":
  version: 2.6.1
  resolution: "cli-spinners@npm:2.6.1"
  checksum: 423409baaa7a58e5104b46ca1745fbfc5888bbd0b0c5a626e052ae1387060839c8efd512fb127e25769b3dc9562db1dc1b5add6e0b93b7ef64f477feb6416a45
@ -11247,13 +11202,6 @@ __metadata:
  languageName: node
  linkType: hard

-"cli-width@npm:^3.0.0":
-  version: 3.0.0
-  resolution: "cli-width@npm:3.0.0"
-  checksum: 4c94af3769367a70e11ed69aa6095f1c600c0ff510f3921ab4045af961820d57c0233acfa8b6396037391f31b4c397e1f614d234294f979ff61430a6c166c3f6
-  languageName: node
-  linkType: hard
-
 "cliui@npm:^3.2.0":
  version: 3.2.0
  resolution: "cliui@npm:3.2.0"
@ -11614,13 +11562,6 @@ __metadata:
  languageName: node
  linkType: hard

-"commander@npm:^9.0.0":
-  version: 9.2.0
-  resolution: "commander@npm:9.2.0"
-  checksum: 7c82e4cd969712aa6d7c055b8351807a7230f9f31ef7ec7881e11a1147511de85adf5d6ccfd200240a118eecf693b220caf6865b8efbcea558a70d35aa9ed711
-  languageName: node
-  linkType: hard
-
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  version: 1.3.1
  resolution: "comment-parser@npm:1.3.1"
@ -20149,7 +20090,7 @@ __metadata:
  languageName: node
  linkType: hard

-"istanbul-reports@npm:^3.0.0, istanbul-reports@npm:^3.1.3":
+"istanbul-reports@npm:^3.0.0, istanbul-reports@npm:^3.1.3, istanbul-reports@npm:^3.1.5":
  version: 3.1.5
  resolution: "istanbul-reports@npm:3.1.5"
  dependencies:
@ -20437,19 +20378,6 @@ __metadata:
  languageName: node
  linkType: hard

-"jest-it-up@npm:^2.0.2":
-  version: 2.0.2
-  resolution: "jest-it-up@npm:2.0.2"
-  dependencies:
-    "@inquirer/confirm": ^0.0.14-alpha.0
-    ansi-colors: ^4.1.0
-    commander: ^9.0.0
-  bin:
-    jest-it-up: bin/jest-it-up
-  checksum: 1482d8b9862331b6cc7d858fd1c05d95fb1bc2adbc37e243c20e6e10f259fecf600d3b1023dadf11acadb158ea171677f8f375969e058dff46002be81a49079b
-  languageName: node
-  linkType: hard
-
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  version: 14.0.1
  resolution: "jest-junit@npm:14.0.1"
@ -23126,11 +23054,14 @@ __metadata:
    improved-yarn-audit: ^3.0.0
    ini: ^3.0.0
    is-retry-allowed: ^2.2.0
+    istanbul-lib-coverage: ^3.2.0
+    istanbul-lib-report: ^3.0.0
+    istanbul-reports: ^3.1.5
    jest: ^29.1.2
    jest-canvas-mock: ^2.3.1
    jest-environment-jsdom: ^29.1.2
-    jest-it-up: ^2.0.2
    jest-junit: ^14.0.1
+    js-yaml: ^4.1.0
    jsdom: ^11.2.0
    json-rpc-engine: ^6.1.0
    json-rpc-middleware-stream: ^2.1.1
@ -23985,13 +23916,6 @@ __metadata:
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-"mute-stream@npm:^0.0.8":
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-  resolution: "mute-stream@npm:0.0.8"
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-  languageName: node
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  resolution: "nan@npm:2.15.0"
@ -29048,13 +28972,6 @@ __metadata:
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-"run-async@npm:^2.3.0":
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-  resolution: "run-async@npm:2.4.1"
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-  languageName: node
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-
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  resolution: "run-parallel@npm:1.1.9"